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Daily Sudoku Answer 



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Dec 29 - Super Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s126898



Reasoning 



R2C5 can only be <9>

R5C5 can only be <4>

R8C5 can only be <1>

R6C5 can only be <6>

R1C4 can only be <6>

R1C6 can only be <8>

R4C5 can only be <8>

R4C6 can only be <3>

R4C1 can only be <4>

R4C9 can only be <7>

R9C6 can only be <9>

R5C4 can only be <7>

R6C4 can only be <9>

R4C4 can only be <1>

R9C4 can only be <3>

R3C1 is the only square in row 3 that can be <8>

R7C9 is the only square in row 7 that can be <9>

R1C8 is the only square in row 1 that can be <9>

R9C2 is the only square in row 9 that can be <8>

Squares R2C2 and R5C2 in column 2 form a simple naked pair. These 2 squares both contain the 2 possibilities <35>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R1C2 - removing <5> from <245> leaving <24>

R8C2 - removing <3> from <234> leaving <24>

Squares R5C8 and R8C8 in column 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <23>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R2C8 - removing <3> from <137> leaving <17>

Intersection of row 3 with block 3. The value <2> only appears in one or more of squares R3C7, R3C8 and R3C9 of row 3. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.

R1C7 - removing <2> from <247> leaving <47>

R1C9 - removing <2> from <1245> leaving <145>

Squares R1C7 and R9C7 in column 7 form a simple naked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.

R3C7 - removing <4> from <234> leaving <23>

R7C7 - removing <7> from <237> leaving <23>

Squares R7C7 and R8C8 in block 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <23>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.

R8C9 - removing <23> from <2346> leaving <46>

Intersection of row 7 with block 7. The value <7> only appears in one or more of squares R7C1, R7C2 and R7C3 of row 7. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.

R9C1 - removing <7> from <567> leaving <56>

R9C3 - removing <7> from <457> leaving <45>

Squares R3C3 and R7C3 in column 3 and R3C7 and R7C7 in column 7 form a Simple X-Wing pattern on possibility <3>. All other instances of this possibility in rows 3 and 7 can be removed.

R7C1 - removing <3> from <237> leaving <27>

R3C9 - removing <3> from <234> leaving <24>

Squares R3C3 (XY), R2C2 (XZ) and R9C3 (YZ) form an XY-Wing pattern on <5>. All squares that are buddies of both the XZ and YZ squares cannot be <5>.

R1C3 - removing <5> from <457> leaving <47>

R9C3 is the only square in column 3 that can be <5>

R9C1 can only be <6>

R8C9 is the only square in row 8 that can be <6>

R8C2 is the only square in row 8 that can be <4>

R1C2 can only be <2>

Squares R1C3 and R1C7 in row 1 form a simple naked pair. These 2 squares both contain the 2 possibilities <47>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R1C1 - removing <7> from <157> leaving <15>

R1C9 - removing <4> from <145> leaving <15>

Squares R6C9 and R8C1 form a remote naked pair. <23> can be removed from any square that is common to their groups.

R6C1 - removing <3> from <35> leaving <5>

R6C6 can only be <2>

R1C1 can only be <1>

R5C2 can only be <3>

R6C9 can only be <3>

R5C6 can only be <5>

R5C8 can only be <2>

R1C9 can only be <5>

R2C9 can only be <1>

R2C8 can only be <7>

R9C9 can only be <4>

R2C2 can only be <5>

R8C8 can only be <3>

R8C1 can only be <2>

R7C7 can only be <2>

R9C7 can only be <7>

R3C9 can only be <2>

R2C1 can only be <3>

R9C8 can only be <1>

R1C7 can only be <4>

R3C7 can only be <3>

R7C1 can only be <7>

R1C3 can only be <7>

R3C3 can only be <4>

R7C3 can only be <3>



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